Bug (or my fault) in nginx-0.7.27 ?

[MS]

When I run: nginx -t to test my nginx.conf I get: 

2008/12/17 02:59:58 [warn] 9391#0: duplicate MIME type "text/html" in
/home/scardig/local/nginx/conf/nginx.conf:30
2008/12/17 02:59:58 [info] 9391#0: the configuration file
/home/scardig/local/nginx/conf/nginx.conf syntax is ok
2008/12/17 02:59:58 [info] 9391#0: the configuration file
/home/scardig/local/nginx/conf/nginx.conf was tested successfully


my line 30 is:

gzip_types       text/plain text/html text/css application/x-javascript text/xml
application/xml application/xml+rss text/javascript application/atom+xml;

my bug :) or nginx bug ?

tnx